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Histological characteristics of the oocyte chorion in wild post-spawning and artificially matured Japanese eels Anguilla japonica

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Title: Histological characteristics of the oocyte chorion in wild post-spawning and artificially matured Japanese eels Anguilla japonica
Authors: Izumi, Hikari Browse this author
Hagihara, Seishi Browse this author
Kurogi, Hiroaki Browse this author
Chow, Seinen Browse this author
Tsukamoto, Katsumi Browse this author
Kagawa, Hirohiko Browse this author
Kudo, Hideaki Browse this author →KAKEN DB
Ijiri, Shigeho Browse this author →KAKEN DB
Adachi, Shinji Browse this author →KAKEN DB
Keywords: Oocyte chorion
Wild adult eel
Artificially matured eel
Japanese eel
Anguilla japonica
Spawning migration
Issue Date: Mar-2015
Publisher: Springer
Journal Title: Fisheries science
Volume: 81
Issue: 2
Start Page: 321
End Page: 329
Publisher DOI: 10.1007/s12562-015-0851-1
Abstract: To describe the histological characteristics of the oocyte chorion in wild adult and artificially matured Japanese eels, we investigated changes in chorion thickness during artificially induced oogenesis and compared the chorion thickness and ultrastructure between wild and artificially matured eels. In artificially maturing eels, the chorion thickness and volume increased significantly with increasing follicle diameter, peaking at approximately 450 A mu m; beyond this point, the chorion thinned significantly, whereas there were no significant changes in volume. A significant positive correlation was observed between the number of salmon pituitary extract (SPE) injections and chorion thickness. In wild post-spawning adult eels, chorion thickness varied among individuals, and two had chorions that were significantly thinner than those of artificially matured eels. Ultrastructural examination revealed electron-dense layers in the chorions of wild post-spawning adult eels, as was seen in artificially matured eels. This result is inconsistent with our hypothesis that the formation of an electron-dense layer is unique to artificially maturing eels due to repeated SPE injections. These results suggest that the formation cycle of the chorion might be affected by SPE injections in artificially maturing eels, whereas that of wild eels might be synchronized with behavioral and/or environmental fluctuations that occur during the oceanic spawning migration.
Rights: The final publication is available at
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 井尻 成保

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